for (int c0 = -99; c0 <= 100; c0 += 1) {
  if (c0 <= 0)
    S1(1, -c0 + 1);
  for (int c1 = max(1, -2 * c0 + 3); c1 <= min(199, -2 * c0 + 199); c1 += 2) {
    S2(((c1 - 1) / 2) + c0, (c1 + 1) / 2);
    S1(((c1 + 1) / 2) + c0, (c1 + 1) / 2);
  }
  if (c0 >= 1)
    S2(100, -c0 + 101);
}
